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This small high speed router has the round bottom shape arbide cutter (5/8" in diameter) installed for the purfling channel machining. The spinning cutter is lowered onto the plate and the plate is carefully fed in a clockwise direction (against the cutters rotation) while keeping the edge firmly against the guide bearing.

Here both plates have been machined. Notice that the area across the button (neck area) of the back plate and the corners can not be cut with the router, these must be hand finished.

In this view, I have used hand gouges to rough out the channel shape at the four corners.